CVE-2021-22925 (GCVE-0-2021-22925)

Vulnerability from cvelistv5 – Published: 2021-08-05 00:00 – Updated: 2026-10-14 11:08
VLAI
Summary
curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 16:36 UTC
CWE
  • CWE-200 - Information Disclosure (CWE-200)
Assigner
hackerone CNA under the mitre root
CNA scorecard D 59/100 over 187 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
n/a https://github.com/curl/curl Affected: curl 7.7 to and including 7.77.0
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
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                    "version": "V3.1.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "V3.1.5",
                    "status": "affected",
                    "version": "V3.1.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "V3.1.5",
                    "status": "affected",
                    "version": "V3.1.0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-14T11:08:19.129Z",
              "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
              "shortName": "siemens-SADP"
            },
            "references": [
              {
                "url": "https://cert-portal.siemens.com/productcert/html/ssa-389290.html"
              },
              {
                "url": "https://cert-portal.siemens.com/productcert/html/ssa-484086.html"
              },
              {
                "url": "https://cert-portal.siemens.com/productcert/html/ssa-398330.html"
              }
            ],
            "x_adpType": "supplier"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "NETWORK",
                  "availabilityImpact": "NONE",
                  "baseScore": 5.3,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "LOW",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "NONE",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-22925",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-04-16T16:36:17.820310Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-04-16T13:47:29.588Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "https://github.com/curl/curl",
              "vendor": "n/a",
              "versions": [
                {
                  "status": "affected",
                  "version": "curl 7.7 to and including 7.77.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application."
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-200",
                  "description": "Information Disclosure (CWE-200)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2022-12-19T00:00:00.000Z",
            "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
            "shortName": "hackerone"
          },
          "references": [
            {
              "url": "https://hackerone.com/reports/1223882"
            },
            {
              "name": "FEDORA-2021-5d21b90a30",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FRUCW2UVNYUDZF72DQLFQR4PJEC6CF7V/"
            },
            {
              "name": "20210921 APPLE-SA-2021-09-20-8 Additional information for APPLE-SA-2021-09-13-4 Security Update 2021-005 Catalina",
              "tags": [
                "mailing-list"
              ],
              "url": "http://seclists.org/fulldisclosure/2021/Sep/40"
            },
            {
              "name": "20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6",
              "tags": [
                "mailing-list"
              ],
              "url": "http://seclists.org/fulldisclosure/2021/Sep/39"
            },
            {
              "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
            },
            {
              "url": "https://security.netapp.com/advisory/ntap-20210902-0003/"
            },
            {
              "url": "https://support.apple.com/kb/HT212805"
            },
            {
              "url": "https://support.apple.com/kb/HT212804"
            },
            {
              "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
            },
            {
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
            },
            {
              "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf"
            },
            {
              "name": "GLSA-202212-01",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://security.gentoo.org/glsa/202212-01"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "assignerShortName": "hackerone",
        "cveId": "CVE-2021-22925",
        "datePublished": "2021-08-05T00:00:00.000Z",
        "dateReserved": "2021-01-06T00:00:00.000Z",
        "dateUpdated": "2026-10-14T11:08:19.129Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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